OpenAI API (Free Tier)
OpenAI offers a free tier with limited credits for new accounts and regular rate limits for free users.
🚀 Key Specs (2026 Update)
- Model Support: GPT-5.1, GPT-5.4 mini, GPT-5.4 nano, GPT Image 1.5.
- 🚨 Retirement Notice: GPT-4o API was officially retired on Feb 16, 2026.
- Rate Limit (Free Tier):
- GPT-5.4 mini: Up to 10 RPM / 250 RPD based on account status.
- GPT-5.1: Trial credits only ($5 initial for new accounts).
- Region Support: Globally available.
- Credit Card Required: Optional for basic free tier, but required for higher limits.
🗝 How to get an API Key
- Go to platform.openai.com.
- Login or Create an Account.
- Navigate to Dashboard -> API Keys.
- Generate a new key.
🛠 Usage Example
See openai-chat.sh for a cURL implementation.